syzbot

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BUG: KCSAN: data-race in __perf_event_overflow / perf_event_exit_event

read to 0xffff888146cd630c of 4 bytes by task 2535 on cpu 0:
 perf_event_wakeup kernel/events/core.c:6498 [inline]
 perf_event_exit_event+0x5ed/0x790 kernel/events/core.c:12765
 perf_event_exit_task_context kernel/events/core.c:12831 [inline]
 perf_event_exit_task+0x49a/0x630 kernel/events/core.c:12864
 do_exit+0x5e6/0x16a0 kernel/exit.c:815
 do_group_exit+0xa5/0x160 kernel/exit.c:935
 get_signal+0x8cf/0x15d0 kernel/signal.c:2862
 arch_do_signal_or_restart+0x8c/0x2e0 arch/x86/kernel/signal.c:868
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x113/0x190 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 ret_from_fork+0x15/0x30

write to 0xffff888146cd630c of 4 bytes by interrupt on cpu 1:
 __perf_event_overflow+0x76/0x1e0 kernel/events/core.c:9280
 perf_swevent_hrtimer+0x255/0x310 kernel/events/core.c:10682
 __run_hrtimer+0x163/0x460 kernel/time/hrtimer.c:1685
 __hrtimer_run_queues kernel/time/hrtimer.c:1749 [inline]
 hrtimer_interrupt+0x37e/0xac0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0xa3/0x240 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x88/0xb0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20
 account_kernel_stack+0x208/0x2a0 kernel/fork.c:389
 release_task_stack+0x44/0x1e0 kernel/fork.c:433
 put_task_stack+0x38/0x80 kernel/fork.c:445
 finish_task_switch+0x1b7/0x280 kernel/sched/core.c:4898
 context_switch kernel/sched/core.c:4989 [inline]
 __schedule+0x43a/0x690 kernel/sched/core.c:6295
 preempt_schedule_common kernel/sched/core.c:6461 [inline]
 __cond_resched+0x3f/0x90 kernel/sched/core.c:8174
 might_resched include/linux/kernel.h:110 [inline]
 switch_task_namespaces kernel/nsproxy.c:241 [inline]
 exit_task_namespaces+0x14/0xa0 kernel/nsproxy.c:254
 copy_process+0x2225/0x2f30 kernel/fork.c:2409
 kernel_clone+0x15c/0x6a0 kernel/fork.c:2555
 __do_sys_clone kernel/fork.c:2672 [inline]
 __se_sys_clone kernel/fork.c:2656 [inline]
 __x64_sys_clone+0xc6/0xf0 kernel/fork.c:2656
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2480 Comm: syz-executor.4 Tainted: G        W         5.17.0-rc2-syzkaller-00039-g9f7fb8de5d9b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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